I Am 16 Years Old And Have Been Off Of

I am 16 years old and have been off of birth control for about a year and a half. I have not had a regular period since, and I recently have had sex. I have had bloating and backaches this week but I'm not sure if I'm about to start my period or if I'm pregnant? My last period started on 11/25/16 and condoms have not broken once.